"The disciple should accept the words of his spiritual master without hesitation. Whatever the spiritual master orders should be taken without argument." SB 3.24.13, p.

Prabhupada said, “Persons who strictly follow the orders of the spiritual master are useful in executing the will of the Supreme, whereas persons who deviate from the strict order of the spiritual master are useless.” – Caitanya-caritamrta Adi-lila 12.10, purport

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Verse:

“The order of the spiritual master is the active principle in spiritual life. Anyone who disobeys the order of the spiritual master immediately becomes useless.”

Purport:

“Here is the opinion of Srila Krishnadasa Kaviraja Gosvami. Persons who strictly follow the orders of the spiritual master are useful in executing the will of the Supreme, whereas persons who deviate from the strict order of the spiritual master are useless.”